Cited by 206HER2/EGFR in Cancer ResearchPharmacogenetics and Drug MetabolismLung Cancer Treatments and Mutations

Clinical Pharmacokinetics and Pharmacodynamics of Afatinib

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Wind, Sven, Schnell, David, Ebner, Thomas, Freiwald, Matthias, Stopfer, Peter·2017·Clinical Pharmacokinetics

Abstract

Afatinib is an oral, irreversible ErbB family blocker that covalently binds to the kinase domains of epidermal growth factor receptor (EGFR), human EGFRs (HER) 2, and HER4, resulting in irreversible inhibition of tyrosine kinase autophosphorylation. Studies in healthy volunteers and patients with advanced solid tumours have shown that once-daily afatinib has time-independent pharmacokinetic characteristics. Maximum plasma concentrations of afatinib are reached approximately 2-5 h after oral administration and thereafter decline, at least bi-exponentially. Food reduces total exposure to afatinib. Over the clinical dose range of 20-50 mg, afatinib exposure increases slightly more than dose proportional. Afatinib metabolism is minimal, with unchanged drug predominantly excreted in the faeces and approximately 5 % in urine. Apart from the parent drug afatinib, the major circulation species in human plasma are the covalently bound adducts to plasma protein. The effective elimination half-life is approximately 37 h, consistent with an accumulation of drug exposure by 2.5- to 3.4-fold based on area under the plasma concentration-time curve (AUC) after multiple dosing. The pharmacokinetic profile of afatinib is consistent across a range of patient populations. Age, ethnicity, smoking status and hepatic function had no influence on afatinib pharmacokinetics, while females and patients with low body weight had increased exposure to afatinib. Renal function is correlated with afatinib exposure, but, as for sex and body weight, the effect size for patients with severe renal impairment (approximately 50 % increase in AUC) is only mildly relative to the extent of unexplained interpatient variability in afatinib exposure. Afatinib has a low potential as a victim or perpetrator of drug-drug interactions, especially with cytochrome P450-modulating agents. However, concomitant treatment with potent inhibitors or inducers of the P-glycoprotein transporter can affect the pharmacokinetics of afatinib. At a dose of 50 mg, afatinib does not have proarrhythmic potential.

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Crossref · 10.1007/s40262-016-0440-1

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  • Concomitant administration of ritonavir has shown no relevant impact on afatinib pharmacokinetics in healthy male adults.

    “concomitant administration of ritonavir, a well-known, potent inhibitor of P-glycoprotein and BCRP (another ATP binding cassette drug transporter inhibitor) has shown no relevant impact on afatinib pharmacokinetics in healthy male adults.”

    From Afatinib for the treatment of <i>EGFR</i> mutation-positive NSCLC: A review of clinical findings (2020) · cites this paper as [62]

    The Drug–Drug Interactions > Ritonavir section reports no relevant change in afatinib exposure when ritonavir was administered concomitantly with a 40 mg afatinib dose in healthy subjects. The claim omits that dose limitation, and our copy does not specify that the subjects in these studies were male adults. The section also reports increased exposure with a different dosing schedule. (LLM, conf=0.87)

    Experimental — accuracy not yet measured
  • Afatinib is highly soluble across the physiological pH range of 1-7.5 and is not expected to interact with acid-reducing agents.

    “Afatinib is highly soluble across the physiological pH range of 1–7.5 and is not expected to interact with acid-reducing agents.”
  • Smoking status does not impact the pharmacokinetics of afatinib.

    “Smoking status does not impact the pharmacokinetics of afatinib”
  • P-glycoprotein inducers such as rifampicin can reduce afatinib exposure.

    “P-glycoprotein inducers such as rifampicin can reduce afatinib exposure.”
  • Afatinib does not relevantly inhibit or induce CYP enzymes, so the risk of interactions with co-administered drugs metabolized by CYP enzymes is thought to be minimal.

    “afatinib does not relevantly inhibit or induce CYP enzymes, including those involved in drug metabolism.62 Therefore, the risk of interactions between afatinib and co-administered drugs that undergo CYP enzyme metabolism is thought to be minimal.”

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Authors
Wind, S., Schnell, D., Ebner, T., Freiwald, M., & Stopfer, P.
Affiliations
Boehringer Ingelheim (Germany) (DE)
Corresponding author
Wind, Sven
Venue
Clinical Pharmacokinetics
Published
2016-07-28
Volume
56
Issue
3
Pages
235-250
ISSN
  • 0312-5963 (ISSN-L)
  • 1179-1926
OpenAlex
W2484071785
Cited by
206
References
53
Citations by year
2026: 14 · 2025: 23 · 2024: 21 · 2023: 28 · 2022: 35 · 2021: 18 · 2020: 24 · 2019: 15 · 2018: 17 · 2017: 9 · 2016: 1
FWCI
1.41
Type
journal article
Language
en
Open access
Locations
  • Clinical Pharmacokinetics (publishedVersion, cc-by-nc)
  • PubMed Central (publishedVersion, cc-by-nc)
  • PubMed (publishedVersion)
Funders
Boehringer Ingelheim
Topics
  • Health Sciences › Medicine › Oncology › HER2/EGFR in Cancer Research
  • Life Sciences › Pharmacology, Toxicology and Pharmaceutics › Pharmacology › Pharmacogenetics and Drug Metabolism
  • Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Lung Cancer Treatments and Mutations
Keywords
afatinib, EGFR, HER2, ErbB4, pharmacokinetics, pharmacodynamics, food effect, dose proportionality, renal dysfunction, P-glycoprotein, drug-drug interactions, covalent protein adducts, drug-induced arrhythmia, interindividual variability, advanced solid tumors
MeSH terms
Afatinib, Animals, Drug Interactions, Humans, Kidney, Liver, Neoplasms, Protein Binding, Quinazolines, Radiation-Sensitizing Agents, ATP Binding Cassette Transporter, Subfamily B, Member 1, Protein Kinase Inhibitors, ErbB Receptors

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